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Preliminary CompactFlash Memory Card Product Manual

6.1.28 Write Sector(s) - 30H, 31H

Bit -> 7 6 5 4 3 2 1 0

Command (7)

30H or 31H

C/D/H (6)

1 LBA 1 Drive Head (LBA 27-24)

Cyl High (5)

Cylinder High (LBA 23-16)

Cyl Low (4)

Cylinder Low (LBA 15-8)

Sec Num (3)

Sector Number (LBA 7-0)

Sec Cnt (2)

Sector Count

Feature (1)

This command writes from 1 to 256 sectors as

specified in the Sector Count Register. A sector

count of zero requests 256 sectors. The transfer

begins at the sector specified in the Sector Number

CompactFlash Memory Card sets BSY, then sets

DRQ and clears BSY, then waits for the host to fill

the sector buffer with the data to be written. No

interrupt is generated to start the first buffer fill

operation. No data should be transferred by the

host until BSY has been cleared by the host.

For multiple sectors, after the first sector of data is

in the buffer, BSY will be set and DRQ will be

cleared. After the next buffer is ready for data,

BSY is cleared, DRQ is set and an interrupt is

generated. When the final sector of data is

transferred, BSY is set and DRQ is cleared. It will

remain in this state until the command is

completed at which time BSY is cleared and an

interrupt is generated.

If an error occurs during a write of more than one

sector, writing terminates at the sector where the

error occurs. The Command Block Registers

contain the cylinder, head and sector number of

the sector where the error occurred. The host may

then read the command block to determine what

error has occurred, and on which sector.

6.1.29 Write Sector(s) without Erase - 38H